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US 4,382,058 AGranted
Process for forming a single-walled blow molded hinged container
AssigneeW. R. Grace & Co., Cryovac Division
InventorsKeith M. Watson, Floyd L. Jones, Dwight V. Adams
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Abstract
A blow molded single-walled closable container having a compression molded hinge portion is produced by closing a blow mold with a restricted central portion about a parison so as to form two hinge portions and severing the thus formed article into two sections with each of the sections forming a closable container having a top portion and a bottom portion connected by a hinge portion.
Claims3
A process for forming a single-walled blow molded container comprising a top portion and a bottom portion connected by a compression molded hinge portion, comprising the steps of:
- initiating closing of a blow mold comprising means defining a restricted hinge forming minor cavity connecting major cavities and communicating with hinge bar introducing means and hinge bar receiving means about a parison;
- inserting a hinge bar through said hinge bar introducing means so as to pierce said parison, pass through said restricted hinge forming minor cavity and into said hinge bar receiving means;
- completing said closing of said blow mold about said parison to compression mold a portion of said parison located between said hinge bar and a surface of said restricted hinge forming minor cavity;
- inflating said parison to form an article by conforming said parison to the geometry of said cavities;
- removing the article from the blow mold;
- and
- severing the article to form two of said containers.
4 more elements
Dependencies are inferred from the claim text.